Roller-mill.



1 No. 791.833. PATENTEDJUNE6,1905.

' s SNYDER.

ROLLER MILL.

' APPLICATION FILED APR.11, 1903.

2 sums-Burr 1.

WITNES I 1 [NVENfOk a. 12131 Jim Atto'meyw UNITED STATES Patented June6, 1905.

PATENT 1 OFFICE.

SIMON SNYDER, O'F MUNOY, PENNSYLVANIA, ASSIGNOR TO SPROUT, WAL- DRON ANDCOMPANY, OF MUNOY, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

ROLLER-MILL. g U

SPECIFICATION forming part of Letters Patent No. 791,833, dated June 6,1905. --Application filed April 11,1903. Serial No. 152,166.

Improvements in Roller-Mills; and I do hereby declare the following tobe a full, clear, and

exact description of the invention, such as will enable others skilledin theart to which it appertains to make and use the same.

This invention relates to roller-mills in which the grain or middlingsis fed from a hopper or hoppers to one or more pairs of grinding orcrushing rolls, one of which rolls of every pair is adjustable ormounted in movable bearings held with yielding pressure against theother roll and capable of being gradually adjusted thereto as well assuddenly shifted forl the purpose of opening and closing the ro s.

The invention refers more particularly to the roll regulating andadjusting mechanism; and its principal object is to provide an improveddevice whereby the spring which maintains the adjustable roll yieldinglyagainstthe other can be adjusted to any desired tension, while themovable roll can be gradually adjusted as well as suddenlyshifted'without affecting the tension of such spring and by means ofwhich much more delicate and finer adjustments of the rolls can beobtained than with prior devices of the same character.

The invention will hereinafter be first fully described, with referenceto the accompanying drawings, which form a part of this specification,and then pointed out "in the claims following the description.

' In said drawings, Figure 1 represents a double roller-mill embodyingmy invention, principally in side elevation, "but with parts in verticalsection. Fig. 2 is a top plan view of the rolls and adjusting mechanismwith the covers removed. Fig. 3 is a detail longitudinal ver-" ticalsection of one of the boxes or shells contaming a pressure-spring andother parts.

In general arrangement and deslgn the mill may be of the usual or anysuitable type.

The letter A in the drawings denotes the framework, and-B indicates thehoppers, be-

j ism of the inner and outer rolls.

tween which is shown a central exhaust-passage, while beneath them isshown a suitable shaking-shoe for evenly distributing the material tothe rolls.

The letter O designates the inner non-adjustable rolls, and D the outeradjustable rolls, the bearings of which latter are shown mounted inmovable supports or rock-arms E. Said arms are shown fulcrumed onsleeves e, journaled on eccentric pivots e, for the purpose of adjustingsaid fulcrums to obtain parallel Each of said arms or supports E has abox or shell F, inclosing a coiled spring Gr, such as ordinarily usedfor maintaining a yielding pressure between the grinding-surfaces toallow obstructions to pass through them without injuring the connectingparts. Said spring surrounds a sleeve H, being interposed between aprojection or flange it on and near the outer end of said sleeve and aninternal projection or flange f on and near the inner end of the box orshell. At its inner end the sleeve is exteriorly threaded and screwsinto a fixed or non- 'rotatable nut J, located at the inner sideof theflange or abutment f, which nut may be fitted. in a suitably-shaped partof the box to prevent its rotation and may be slipped into such part ofthe box through a side opening therein, as shown at the right-hand boxof the present machine. I

The roll operating or adjusting rods K pass through the sleeves H, eachof which is preferably chambered out except for a suitable length at itsouter end, where it is bored and internally threaded to receive acorrespondingly-threaded part 70 of its inclosed rod. The

inner ends k of the rods are also threaded with threads of lesser ordifferent pitch from those of the outer parts 74, and in the presentembodiment of the invention said inner ends are screwed into castings L,mounted on eced couplings. The adjusting-rods may be provided at theirouter ends with hand-wheels P or other suitable devices for turningthem, and lock-nuts Q, preferably of the wheel or wing type, may bescrewed on the outer threaded parts it of said rods.

The operation of the roll regulating and adjusting mechanism is asfollows: The tension of each of the springs G is adjusted by turning thesleeve H, inclosed thereby, thus screwing or unscrewing said sleeve inits non-rotatable nut J, and thereby compressing the spring between theabutments f and lb or allowing it to retract. To this end the locknutwheel Q may be unscrewed or loosened, the adjustingrod held stationary,and the sleeve turned independently thereon, for which purpose the outerends of the sleeves are shown formed with flattened parts it forengagement by a wrench or turning tool, or, if desired, the sleeve H androd K may be turned together, though the former way is preferred. Ineither event any diflerence of pitch existing between the threads of 7:;and J or and J, as the case may be, will be compensated for by movementof the rockarm or support E, thus avoiding any lock-nut action betweensuch threads. The desired tension of the spring being obtained, theproper adjustment of the rolls for grinding is attained by loosening thelock nut or wheel Q and rotating the roll-operating rod K by means ofits hand-wheel P, which causes the arm E to advance or move back,carrying with it the bearing of the roll. Now, as before stated, thethreads on the outer and inner ends of the rod are of different pitch,those at the outer end being preferably of greater pitch. Hence onturning the rod it will advance or withdraw different distances in thesleeve H and casting L, causing said sleeve to move oppositely to thelongitudinal movement of the rod a distance equal to the differencebetweenthe relative movements of the rod in its sleeve and the rod inits eccentric casting. For instance, in practice the threads on the partis are usually out about seven to the inch, while those at the inner end70 are usually cut about twelve to the inch. Hence for each rotation ofthe rod in a direction to advance the sleeve H thereon said sleeve Had.- vances one-seventh of an inch, while the rod moves back from itscasting L one-twelfth of an inch, so that the total advance of the outerroll is five eighty-fourths of an inch. By this means one can effectexceedingly fine and delicate adjustments, which are not obtainable withthe ordinary adusting-screws usually em ployed, since each turn orrotation of the latter causes the roll to advance several times as farasthe same turn of my adjusting-rod. The sleeve H does not turn when therod K is rotated to adjust the rolls, and consequently the tension ofthe spring G is in no wise affected by the grinding adjustments andremains unaltered unless the operator changes the tension by rotatingthe sleeve H. Preferably the threads of J are different in pitch fromeither those of 7 or 70, so as to prevent sleeve H from turning when rodK is rotated, though this need not necessarily be so, for if the threadsof J were equal in pitch to those either of/c or 77 the sleeve could beheld stationary during rotation of the rod. The construction allows therolls to yield or move apart to a great extent to allow the passage ofany large obstruction, since the abutment f can move outward any extentpermitted by the spring. To open the rolls, the shaft N is turned toshift the roll-operating rods, and the spring-boxes are moved outward bythe nuts J abutting against the projections or flanges f. It is obviousthat such movement does not affect the tension of the springs, since themovable roll-supporting arms, springboxes, and inclosed parts can bemoved or operated at all times as integral parts.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent of' the United States, is-- 1. In aroller-mill, the combination of a pair of grinding-rolls, one of whichis adjustable to and from the other, a movable journal-support for saidadjustable roll, a shifting device, and an adjusting-rod connecting saiddevice and support and coupled to them by screw connections the threadsof which are of different pitch, with yielding or spring-opposed meanspermitting backward movement of said support along the length of saidrod to allow separation of the rolls for passage of obstructions.

2. In a roller-mill, the combination of a pair of grinding-rolls, oneadjustable from and to the other, a movable journal-support for saidadjustable roll, a shifting device, an adjusting-rod connecting saiddevice and support, said rod having adjustable connections with saiddevice and support which when the rod is moved independently effectditlerent adjustments of said device and support along the length ofsaid rod, the connection to said support also permitting it to movelongitudinally along said rod away from the bearing of the other roll,and means yieldingl y opposing such movement.

3. In a roller-mill, the combination of a pair of grinding-rolls, amovable journal-support for one roll, a shifting device, and anadjusting-rod connecting said device with said support, a nut on saidhub, a spring acting be tween said nut and support permitting the latterto move longitudinally along the rod to allow yielding of the movableroll, means for adjusting the tension of the spring, and meansindependent of said spring-adjusting means whereby the rod can bedifferentially adjusted with relation to said support and shiftingdevice.

4. In a roller-mill, the combination of a pair of grinding-rolls, amovable journal-support for one of said rolls, a shifting device, anadjusting-rod coupled thereto, a member screwed to said rod having meansfor engaging said support when the shifting device is moved to open therolls, and a spring acting between said member and said support normallyresisting independent movement of the latter for separation of therolls.

5. In a roller-mill,the combination of a pair of grinding-rolls, amovable journal-support for one of said rolls having a spring-box, ashifting device, an adjusting rod coupled thereto and passing throughsaid box, a sleeve inclosed in said box in which the rod is screwed, anon-rotatable nut in which said sleeve is screwed adapted to engage thebox when the rod is shifted to open the rolls, and a spring actingbetween said box and sleeve normally resisting separation of the rolls.

6. In a roller-mill, the combination of a pair of grinding-rolls, amovable journal-support for one of said rolls having a spring-box, asleeve in said box, a non-rotatable nut in which said sleeve is screwedadapted to engage the box when the sleeve is moved in a direction toopen the rolls, a shifting device, an adjustingrod screwed in saidsleeve and screwed to said shifting device, the threads of said screwconnections being of dilferent pitch, and a spring interposed between asuitable stop on said sleeve and a stop in said box normally resistingseparation of the rolls. 5

7. The combination of a pair'of rolls, a movable support for one of saidrolls, a springbox rigid therewith having an inward projection, a sleevein said box having an outwardlydisposed external projection, anon-rotatable nut abutting the inner side of said inward projection onthe box and in which the inner end of the sleeve is screwed, acompressionspring acting between and against the said projections on thesleeve and box, an adjusting-rod having "a threaded .part screwed insaid sleeve and a threaded part of different pitch screwed to a shiftingdevice, means for rotating said rod, and means for locking said sleeveto said rod.

8. In a roller-mill, the combination of apair of grinding-rolls, amovable journal-support for one of said rolls, a shifting device, anadjusting-rod coupled thereto, a sleeve through which said rod isthreaded having a non-rotatable nut threaded thereon adapted to engagesaid support when the shifting device is moved to open the rolls, and aspring acting between said sleeve and said support normally resistingseparation of the rolls. p

9. In a roller-mill, the combination of a pair of grindingrolls, one ofwhich is adjustable to and from the other, a movable journal-support forsaid adjustable roll, a shifting device, an adjusting-rod coupled tosaid device and support by threaded connections, the coupling to one ofsaid parts permitting an independent 6 5 movement thereof longitudinallyalong said rod, and a spring yieldingly opposing such movement.

10. In a roller-mill, a movable roll-support,

a shifting-rod, a sleeve screwed on said rod having means for engagingsaid roll-support when the rod is moved in one direction, and a springacting between said sleeve and rollsupport yieldingly resistingindependent movement of said roll-support in the same direction.

11. In a roller-mill, a movable roll-support having a spring-box, ashifting-rod, a sleeve screwed therein in said spring-box, anon-rotatable nut in which said sleeve is screwed dependent movement ofthe roll-support in 5 the same direction.

12. In a roller-mill,-the combination of a pair of grinding-rolls, amovable journal-support for one of said rolls, a shifting device,

an adjusting-rod connecting it with said sup- 9 port, a nut on said rod,a spring acting between said nut and support permitting the latter tomove independently along the rod to allow yielding of the movable roll,said nut affording means for adjusting the tension of the spring, andmeans for adjusting the length of the rod between said shifting deviceand support without aflecting the adjustment of the spring.

In testimony whereof I affix my signature in presence of two witnesses.I

SIMON snvnnn.

Witnesses:

STEPHEN Sons, 0. (J. PFLEEGOR.

